If we had the following implementations: public interface InterfaceA { public void printLetter(); } public class ClassB implements InterfaceA { @Override
public void printLetter() {
System.out.println("B");
} } public class ClassC implements InterfaceA { @Override
public void printLetter() {
System.out.println("C");
} } If we intialize the following variable:

Interface a = new ClassB();
ClassB b = new ClassB();
ClassC c = new ClassC();

Are these valid usage of casting?
ClassB b2 = (ClassB) a;
InterfaceA a2 = (InterfaceA) c;

Question

If we had the following implementations: public interface InterfaceA {     public void printLetter(); } public class ClassB implements InterfaceA {     @Override 
     public void printLetter() { 
         System.out.println("B"); 
     } }  public class ClassC implements InterfaceA {     @Override 
     public void printLetter() { 
         System.out.println("C"); 
     } } If we  intialize  the following variable: 
 
 Interface a = new ClassB(); 
 ClassB b = new ClassB(); 
 ClassC c = new ClassC(); 
 
 Are these  valid  usage of casting? 
 ClassB b2 = (ClassB) a; 
 InterfaceA a2 = (InterfaceA) c;

Answer

No, casting c to  InterfaceA  is illegal. You cannot cast a Class to an Interface.

Answer

None of these casting are legal. There is no relation between these Classes and Interface.

Answer

Yes, all of these casting are legal in Java.

Answer

No, casting  a  to  ClassB  is illegal. You cannot cast an Interface to a Class.

Crowdly

If we had the following implementations: public interface InterfaceA { publ...

Want instant access to all verified answers on online.upr.edu?